Water pump cap-screw remover



Sept. 25, 1951 P, H. BOSSEN 2,568,788

WATER PUMP CAP-SCREW REMOVER Filed May 21, 1948 Patented sept. 25, 1951 UNITED l STATES PATENT OFFICE WATER PUMP CAP-SCREW REMOVER Peter H. Bossen, Watertown, S. Dak.

Application May 21, 1948, Serial No. 28,341

1 Claim. l

This invention relates to a water pump capscrew remover, especially adapted forfremoving cap-screws from a water pump of For-d V-8 and Mercury engines, where the cap-screw is located between the radiator connecting hose and the water pump proper. I-

A further object of this invention is the production of Ia simple and eiicient means for iirmly gripping a water pump cap-screw to facilitate the lremoval of a water outlet cap-screw which may have become 'corroded and is otherwise difcult to remove by ordinary methods.

Other objects and advantages of the present invention will appear throughout the following specification and claim.

In the drawing:

Figure 1 is a side elevational View of a portion of an vengine and engine block, -associated with a portion of a radiator, and showing the capscrew remover and adjoining parts in longitudinal section;

Figure 2 is a side elevational View of the capscrew remover;

Figure 3 is an end elevational view of the device with the adjusting plug removed;

Figure 4 is an end elevational View of the device;

Figure 5 is a side elevational view of the adjusting plug;

Figure 6 is a perspective view of the spring collet;

Figure 7 is an end elevational view looking at the inner end of the spring collet.

By referring to the drawing, it will be seen that I designates a fragmentary portion of an engine which supports a water pump II at one end having a projecting right-angularly extending water pump outlet I2 at its lower end. This outlet I2 is in line with the outlet I3 of the radiator I4, the outlet I3 being spaced from the outlet I2. These outlets I2 'and I3 are ladapted to be connected by the conventional removable hose not shown. The conventional water pump outlet cap-screw I secures the pump at its lower end to the engine I0, as shown in Figure 1, and the head I6 of the cap-screw I5 is located at the inner end of .the water pump outlet I2. Because of this location of the cap-s-crew I5, the head I6 thereof becomes corroded by the water which passes through the outlet I2, which outlet forms a communication with the radiator outlet I2 through the medium of a connecting hose. The location of the cap-screw I5 makes its removal, by ordinary methods, very diiiicult. Consequently, I have devised a device in the nature of a 2 specially designed cap-screw remover to overcome this diiculty.

This cap-screw remover comprises a hollow cylindrical or tubular, body II having a tapered inner extremity I8 preferably tapered at approximately 60. An integral external hexagonal nut portion I9 is carried by the outer or opposite end of the body I'I. The outer end of the body I1 is provided with an internal threaded portion 20. The body I'I also is provided with an inner cylindrical smooth bore 2I having an inwardly tapering portion 22 at its inner extremity adjacent the head I6 of the cap-screw I5.

A spring collet 23 is slidably mounted in the bore ZI and comprises a plurality of spring jaws 2d deiined by the longitudinal slots 25 which are formed in the spring collet 23' and extendl through the inner end of the collet 23 but terminate `short` of the opposite end oftheeollet. The jaws 24 taper inwardly or a-re beveled at 26, at their inner extremities, Vso as to cause the jaws 25 to be forced radially inwardly in gripping action against the head I6 of the cap-screw as the inner ends 26 contact the inwardly tapering portion or beveled 'inner face 22 of the body I I while the collet 23 is being forced toward said capscrew. The inner faces of the jaws 24 are preferably beveled, as at 21, at their inner extremities to facilitate the passing of the ends of lthe jaws 24 over the head of the cap-screw I5 to a grip- -ping position, and to dene a plurality of chisellike cap-screw gripping elements. The collet 23 `is cylindrical exteriorly, and hexagonal interiorly, the inner ends of the jaws 24 dening a hexagonal socket for receiving the hexagonal head I6 of th cap-screw I 5.

An adjusting plug 28 is tted in the outer end ofthe body I1, the inner end 29 abutting the adjoining end of the spring collet 23, as shown in Figure 1. The plug 28 is provided with a lefthand threaded portion 3l! which is threaded 'into the internal threaded portion 20 of the body I'I. A square wrench-engaging nut portion 3| is carried by the outer end of the plug 28.

The operation of the device is as follows:

This device or tool works in close quarters between the radiatoroutlet I3 and pump outlet I2, after the lower radiator hose is removed. The body I'I is placed within the outlet I2 as shown, and the adjusting plug 28 is rotated in a counterclockwise direction thereby forcing the spring collet 2.3 axially inwardly to a point where the inner ends of the spring jaw 24 engage the head I6 of the cap-screw I5. By further rotating the plug 28 in the same direction, the inner ends of the jaws 24 will be forced radially inwardly upon the head I6 as they ride upon the tapering portion 22 of the body I'I, under pressure of the plug 28. The body I1 may be firmly held by one nwrench gripping the nut portion I9 while the plug 28 is rotated in a counter-clockwise direction by means of a wrench engaging the nut portion 3l. When the cap-screw I5 has been unthreaded from its position, the spring jaws` 24 may be released fromthe-head IS by threading thelplug 28 in a clockwise direction and thereby withdrawing pressure from the spring collet 23, whereupon the spring nature of the jaws 24 will cause the ends of the jaws to spring away' from the head I5 and by sliding upon the inclined portion 22 the collet 23 will recede away from the head I 6 of the cap-screw I5. The tool may then be removed from the outlet I2. l

It should be understood that as the plug- 28 is threaded inwardly into the body I'I, the plug 28 will frictionally engage and rotate the colletl 23, thereby causing the ends of the chisel-like gripping elements' to cut away any corrosion which may have formed around' the head I8 of the cap-screw I5 and'wliichv mightprevent: the? gripping of the -head i6 of the cap-screw i'by the gripping elements. This rotation of the collet' 23 withithe plug 28 will produce a rotary scrap-Y ing action upon such corrosion, until the gripping elements reach the hexagonall sides of the head I8; after which, the gripping elements will move axially andradially inwardly through such corrosion, s o as to firmly grip the head I8 and thereby facilitate the unthreadingof the screw by operating the device as above set forth. Having described the invention, claimedis: v A' lwater pump vcap-screw remover comprisinga tube-like body to be positioned in a" right angularly extending outlet ofv a water pump, said body having open ends, the body having,Y an inwardly tapering` portion atits inner end to deiiney av restricted opening at its-inner end for fitting over the head ofa water pump anchoring'- cap-screw, ay spring collet slidably fittedA in said body for gripping the head of the cap-screw, said taperingportion engaging and fore-ing"- the collet intoV` what is 4 gripping engagement with the head of the capscrew, an adjusting plug threaded into said body and frictionally engaging the collet for moving the collet longitudinally of the body and into a cap-screw engaging position, said collet being cylindrical exteriorly, so as to freely rotate with said plug within said body, said collet being hexagonal interiorly and having a plurality of spring j aws having tapering ends contacting said inwardly tapering portion ofL the body which forces the jaws into gripping engagement with the head of the cap-screw as said plug and collet are moved longitudinally of said body, the ends of said'spring jaws also having outwardly beveled p inner faces at their extremities to facilitate the placing of the-ends of said jaws over the head of acorroded` cap-screw and defining a plurality of chisel-like cap-screw gripping elements which will cut away corrosion from around the head of the cap-screw as the plug is rotated until the collet 'firmlygrips Hthe headof; the cap-screw,

a wrench-engaging portionv carried by the outerend of said body, a wrench-engaging Vportion carried by the outer end of saidl adjusting; plug, and said plug having a left-hand thread formed' on a portion of the plug engaging the body so asto feed the plug inwardly ofthe body' when the plug yis rotated in a counterfrclockwise direction.

PETER H. BOSSEN.

REFERENCES CITED The following reference/s are of" record in the rile of' this patent:

UNITED STATES 1 ?A'rin'sris` 

